Not anything scientific--would be a 48x48 footprint, which fits your square footage requirement, take away a 12' shed roof along one side and that leaves a 36' wide main building. Just good 'ol stick in the dirt design work.

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"It's not that I don't like people...I just find I am happier when they're not around"

the only issue i see with using fiberglass insulation is the condensation issues - when it's foggy here, the metal sweats/collects condensation. i have a big fan running year round to keep air moving/stop condensation...

And IF you've got ANYTHING to add PLEASE do!!! Nothing is too BIG or TOO small.....

Diggin it!!!

Sure!
When you build it yourself you can do it in stages as when you have the money to buy materials, hire help,otherwise you are stuck with one payment or borrowed money.Thats a biggie for me from the get go! Earlier statement r.e. painting your own car , truck or bike one time just isn't the same senario(entirely different skill set for starters) as a one time pole bldg, unless you simply lack the building skill or time to do it. E.g. even if I didn't have a tractor to bore my post holes I could easily hire out that part locally w/o going all the way to a pro builder.

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"If I had my life to live over,I'd dare to make more mistakes next time...I'd relax,I'd limber up.I'd be sillier than this trip, take fewer things seriously, I would take more chances... take more trips...climb more mountains...swim more rivers...eat more ice cream." Jorge Luis Borges, at age 85